Transmitting an indication of a waveform used by a network node

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may obtain an indication of a waveform associated with a network node, the indication indicating whether the waveform is used by the network node in a Uu link associated with the network node. The first UE may transmit, to a second UE and via a sidelink interface between the first UE and the second UE, the indication of the waveform associated with the network node. Numerous other aspects are described.

What is claimed is: 
     
       1. An apparatus for wireless communication at a first user equipment (UE), comprising:
 a memory; and 
 one or more processors, coupled to the memory, configured to:
 obtain an indication of a waveform associated with a network node, the indication indicating whether the waveform is used by the network node in a Uu link associated with the network node, and wherein the indication includes a bitmap that indicates at least a first bit value or a second bit value for a message in a random access procedure or an initial access, or for a downlink shared channel for a band or a band combination, and wherein the first bit value corresponds to a first waveform type and the second bit value corresponds to a second waveform type; and 
 transmit, to a second UE and via a sidelink interface between the first UE and the second UE, the indication of the waveform associated with the network node. 
 
 
     
     
       2. The apparatus of  claim 1 , wherein the first UE is an in-coverage UE or a relay UE, and the second UE is an out-of-coverage UE. 
     
     
       3. The apparatus of  claim 1 , wherein the indication further indicates that the waveform is a single-carrier waveform, and wherein the single-carrier waveform is a discrete Fourier transform spread orthogonal frequency division multiplexing waveform or a single carrier quadrature amplitude modulation waveform. 
     
     
       4. The apparatus of  claim 1 , wherein the indication further indicates that the waveform is a non-single-carrier waveform, and wherein the non-single-carrier waveform is a cyclic prefix orthogonal frequency division multiplexing waveform. 
     
     
       5. The apparatus of  claim 1 , wherein the indication is further associated with up to K bits to indicate 2 K  waveforms. 
     
     
       6. The apparatus of  claim 1 , wherein the message in the random access procedure or the initial access corresponds to one of: a synchronization signal block, a system information block (SIB) type 1, a message 2, a message 4, or other SIBs. 
     
     
       7. The apparatus of  claim 1 , wherein the one or more processors are configured to transmit the indication of the waveform associated with the network node via radio resource control signaling, a medium access control control element, sidelink control information, or a dedicated sidelink shared channel. 
     
     
       8. The apparatus of  claim 1 , wherein the one or more processors are configured to transmit the indication of the waveform associated with the network node via a sidelink broadcast channel payload associated with a synchronization signal block. 
     
     
       9. The apparatus of  claim 1 , wherein the indication of the waveform associated with the network node is based at least in part on a sidelink primary synchronization signal or a sidelink secondary synchronization signal in a known shuffled order, wherein the indication indicates the waveform associated with a synchronization signal block signal in the Uu link, and wherein the known shuffled order is one of a plurality of dedicated patterns of symbol/sequence shuffling for indicating the waveform associated with the network node. 
     
     
       10. The apparatus of  claim 1 , wherein the indication of the waveform associated with the network node is based at least in part on a sidelink broadcast channel demodulation reference signal (DMRS) mapping, a sidelink broadcast channel DMRS configuration, or sidelink broadcast channel DMRS sequences. 
     
     
       11. The apparatus of  claim 1 , wherein the one or more processors are further configured to:
 receive, from the second UE, a request for the waveform associated with the network node, wherein the indication is transmitted to the second UE based at least in part on the request. 
 
     
     
       12. The apparatus of  claim 1 , wherein the one or more processors are further configured to:
 receive, from the network node, a configuration for transmitting the indication of the waveform associated with the network node to the second UE, wherein the configuration indicates a resource pool for transmitting the indication of the waveform associated with the network node. 
 
     
     
       13. The apparatus of  claim 1 , wherein the one or more processors are further configured to:
 receive, from the network node, a dynamic indication, wherein the indication of the waveform associated with the network node is transmitted to one or more UEs including the second UE based at least in part on the dynamic indication. 
 
     
     
       14. The apparatus of  claim 1 , wherein the one or more processors are configured to transmit the indication of the waveform associated with the network node based at least in part on stored information regarding a scheduled change to a network energy saving mode of the network node. 
     
     
       15. An apparatus for wireless communication at a second user equipment (UE), comprising:
 a memory; and 
 one or more processors, coupled to the memory, configured to:
 receive, from a first UE and via a sidelink interface between the second UE and the first UE, an indication of a waveform associated with a network node, wherein the indication indicates whether the waveform is used by the network node in a Uu link associated with the network node, and wherein the indication includes a bitmap that indicates at least a first bit value or a second bit value for a message in a random access procedure or an initial access, or for a downlink shared channel for a band or a band combination, and wherein the first bit value corresponds to a first waveform type and the second bit value corresponds to a second waveform type; and 
 perform, to the network node, a transmission based at least in part on the waveform associated with the network node. 
 
 
     
     
       16. The apparatus of  claim 15 , wherein the one or more processors are further configured to:
 receive, from the network node and during a random access channel procedure, additional information regarding waveforms used by the network node. 
 
     
     
       17. The apparatus of  claim 15 , wherein the indication further indicates that the waveform is a single-carrier waveform, and wherein the single-carrier waveform is a discrete Fourier transform spread orthogonal frequency division multiplexing waveform or a single carrier quadrature amplitude modulation waveform. 
     
     
       18. The apparatus of  claim 15 , wherein the indication further indicates that the waveform is a non-single-carrier waveform, and wherein the non-single-carrier waveform is a cyclic prefix orthogonal frequency division multiplexing waveform. 
     
     
       19. The apparatus of  claim 15 , wherein the one or more processors are configured to receive the indication of the waveform associated with the network node via radio resource control signaling, a medium access control control element, sidelink control information, or a dedicated sidelink shared channel. 
     
     
       20. The apparatus of  claim 15 , wherein the one or more processors are configured to receive the indication of the waveform associated with the network node via a sidelink broadcast channel payload associated with a synchronization signal block. 
     
     
       21. The apparatus of  claim 15 , wherein the indication of the waveform associated with the network node is based at least in part on a sidelink primary synchronization signal or a sidelink secondary synchronization signal in a known shuffled order, wherein the indication indicates the waveform associated with a synchronization signal block signal in the Uu link, and wherein the known shuffled order is one of a plurality of dedicated patterns of symbol/sequence shuffling for indicating the waveform associated with the network node. 
     
     
       22. The apparatus of  claim 15 , wherein the indication of the waveform associated with the network node is based at least in part on a sidelink broadcast channel demodulation reference signal (DMRS) mapping, a sidelink broadcast channel DMRS configuration, or sidelink broadcast channel DMRS sequences. 
     
     
       23. The apparatus of  claim 15 , wherein the one or more processors are further configured to:
 transmit, to the first UE, a request for the waveform associated with the network node, wherein the indication is received from the first UE based at least in part on the request. 
 
     
     
       24. The apparatus of  claim 15 , wherein the indication of the waveform associated with the network node is based at least in part on a configuration that indicates a resource pool for transmitting the indication of the waveform associated with the network node. 
     
     
       25. The apparatus of  claim 15 , wherein the indication of the waveform associated with the network node is based at least in part on a dynamic indication from the network node. 
     
     
       26. The apparatus of  claim 15 , wherein the one or more processors are configured to receive the indication of the waveform associated with the network node based at least in part on stored information regarding a scheduled change to a network energy saving mode of the network node. 
     
     
       27. A method of wireless communication performed by an apparatus of a first user equipment (UE), comprising:
 obtaining an indication of a waveform associated with a network node, the indication indicating whether the waveform is used by the network node in a Uu link associated with the network node, and wherein the indication includes a bitmap that indicates a first bit value or a second bit value for a message in a random access procedure or an initial access, or for a downlink shared channel for a band or a band combination, and wherein the first bit value corresponds to a first waveform type and the second bit value corresponds to a second waveform type; and 
 transmitting, to a second UE and via a sidelink interface between the first UE and the second UE, the indication of the waveform associated with the network node. 
 
     
     
       28. A method of wireless communication performed by an apparatus of a second user equipment (UE), comprising:
 receiving, from a first UE and via a sidelink interface between the second UE and the first UE, an indication of a waveform associated with a network node, wherein the indication indicates whether the waveform is used by the network node in a Uu link associated with the network node, and wherein the indication includes a bitmap that indicates a first bit value or a second bit value for a message in a random access procedure or an initial access, or for a downlink shared channel for a band or a band combination, and wherein the first bit value corresponds to a first waveform type and the second bit value corresponds to a second waveform type; and 
 performing, to the network node, a transmission based at least in part on the waveform associated with the network node.